<%--
  Created by IntelliJ IDEA.
  User: 陈滨进
  Date: 2021/3/16
  Time: 20:28
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<div>


</div>
<div id="page_nav">
    <%--大于首页，才显示--%>
    <c:if test="${requestScope.page.pageNo > 1}">
        <a href="${ requestScope.page.url}&pageNo=1">首页</a>
        <a href="${ requestScope.page.url }&pageNo=${requestScope.page.pageNo-1}">上一页</a>
    </c:if>
        <%--页码输出的开始--%>
        <c:choose>
            <%--情况1：如果总页码小于等于5 的情况，页码的范围是：1-总页码--%>
            <c:when test="${ requestScope.page.pageTotal <= 5 }">
                <c:set var="begin" value="1"/>
                <c:set var="end" value="${requestScope.page.pageTotal}"/>
            </c:when>
            <%--情况2：总页码大于5 的情况--%>
            <c:when test="${requestScope.page.pageTotal > 5}">
                <c:choose>
                    <%--小情况1：当前页码为前面3 个：1，2，3 的情况，页码范围是：1-5.--%>
                    <c:when test="${requestScope.page.pageNo <= 3}">
                        <c:set var="begin" value="1"/>
                        <c:set var="end" value="5"/>
                    </c:when>
                    <%--小情况2：当前页码为最后3 个，8，9，10，页码范围是：总页码减4 - 总页码--%>
                    <c:when test="${requestScope.page.pageNo > requestScope.page.pageTotal-3}">
                        <c:set var="begin" value="${requestScope.page.pageTotal-4}"/>
                        <c:set var="end" value="${requestScope.page.pageTotal}"/>
                    </c:when>
                    <%--小情况3：4，5，6，7，页码范围是：当前页码减2 - 当前页码加2--%>
                    <c:otherwise>
                        <c:set var="begin" value="${requestScope.page.pageNo-2}"/>
                        <c:set var="end" value="${requestScope.page.pageNo+2}"/>
                    </c:otherwise>
                </c:choose>
            </c:when>
        </c:choose>
        <c:forEach begin="${begin}" end="${end}" var="i">
            <c:if test="${i == requestScope.page.pageNo}">
                【${i}】
            </c:if>
            <c:if test="${i != requestScope.page.pageNo}">
                <a href="${ requestScope.page.url }&pageNo=${i}">${i}</a>
            </c:if>
        </c:forEach>
        <%--页码输出的结束--%>
    <%-- 如果已经 是最后一页，则不显示下一页，末页 --%>
    <c:if test="${requestScope.page.pageNo < requestScope.page.pageTotal}">
        <a href="${ requestScope.page.url }&pageNo=${requestScope.page.pageNo+1}">下一页</a>
        <a href="${ requestScope.page.url }&pageNo=${requestScope.page.pageTotal}">末页</a>
    </c:if>
    共${ requestScope.page.pageTotal }页，${ requestScope.page.pageTotalCount }条记录
    到第<input type="text" value="${param.pageNo}" name="pn" id="pn_input"/>页
    <input id="searchPageBtn" type="button" value="确定">
    <script type="text/javascript">
        $(function () {
            // 跳到指定的页码
            $("#searchPageBtn").click(function () {
                var pageNo = $("#pn_input").val();
                <%--var pageTotal = ${requestScope.page.pageTotal};--%>
                <%--alert(pageTotal);--%>
                // javaScript 语言中提供了一个 location 地址栏对象
                // 它有一个属性叫href .它可以获取浏览器地址栏中的地址
                // href 属性可读，可写
                location.href = "${pageScope.basePath}${ requestScope.page.url }&pageNo=" + pageNo;
            });
        });
    </script>
</div>
